mesa: add/update comments in _mesa_copy_buffer_subdata()

[mesa.git] / src / mesa / drivers / dri / i965 / gen6_sol.c

diff --git a/src/mesa/drivers/dri/i965/gen6_sol.c b/src/mesa/drivers/dri/i965/gen6_sol.c
index 491b39cce12424628cd3966e87678a8d217e0649..41923b7f527f7962e9dd5f7020dea46d947dd171 100644 (file)
--- a/src/mesa/drivers/dri/i965/gen6_sol.c
+++ b/src/mesa/drivers/dri/i965/gen6_sol.c
@@ -26,7 +26,9 @@
  * Code to initialize the binding table entries used by transform feedback.
  */
 
+#include "main/macros.h"
 #include "brw_context.h"
+#include "intel_batchbuffer.h"
 #include "brw_defines.h"
 
 static void
@@ -45,7 +47,8 @@ gen6_update_sol_surfaces(struct brw_context *brw)
 
    for (i = 0; i < BRW_MAX_SOL_BINDINGS; ++i) {
       const int surf_index = SURF_INDEX_SOL_BINDING(i);
-      if (xfb_obj->Active && i < linked_xfb_info->NumOutputs) {
+      if (xfb_obj->Active && !xfb_obj->Paused &&
+          i < linked_xfb_info->NumOutputs) {
          unsigned buffer = linked_xfb_info->Outputs[i].OutputBuffer;
          unsigned buffer_offset =
             xfb_obj->Offset[buffer] / 4 +
@@ -58,6 +61,8 @@ gen6_update_sol_surfaces(struct brw_context *brw)
          brw->bind.surf_offset[surf_index] = 0;
       }
    }
+
+   brw->state.dirty.brw |= BRW_NEW_SURFACES;
 }
 
 const struct brw_tracked_state gen6_sol_surface = {
@@ -69,3 +74,78 @@ const struct brw_tracked_state gen6_sol_surface = {
    },
    .emit = gen6_update_sol_surfaces,
 };
+
+static void
+gen6_update_sol_indices(struct brw_context *brw)
+{
+   struct intel_context *intel = &brw->intel;
+
+   BEGIN_BATCH(4);
+   OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(brw->sol.svbi_0_starting_index); /* BRW_NEW_SOL_INDICES */
+   OUT_BATCH(brw->sol.svbi_0_max_index); /* BRW_NEW_SOL_INDICES */
+   ADVANCE_BATCH();
+}
+
+const struct brw_tracked_state gen6_sol_indices = {
+   .dirty = {
+      .mesa = 0,
+      .brw = (BRW_NEW_BATCH |
+              BRW_NEW_SOL_INDICES),
+      .cache = 0
+   },
+   .emit = gen6_update_sol_indices,
+};
+
+void
+brw_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
+                            struct gl_transform_feedback_object *obj)
+{
+   struct brw_context *brw = brw_context(ctx);
+   const struct gl_shader_program *vs_prog =
+      ctx->Shader.CurrentVertexProgram;
+   const struct gl_transform_feedback_info *linked_xfb_info =
+      &vs_prog->LinkedTransformFeedback;
+   struct gl_transform_feedback_object *xfb_obj =
+      ctx->TransformFeedback.CurrentObject;
+
+   unsigned max_index = 0xffffffff;
+
+   /* Compute the maximum number of vertices that we can write without
+    * overflowing any of the buffers currently being used for feedback.
+    */
+   for (int i = 0; i < BRW_MAX_SOL_BUFFERS; ++i) {
+      unsigned stride = linked_xfb_info->BufferStride[i];
+
+      /* Skip any inactive buffers, which have a stride of 0. */
+      if (stride == 0)
+        continue;
+
+      unsigned max_for_this_buffer = xfb_obj->Size[i] / (4 * stride);
+      max_index = MIN2(max_index, max_for_this_buffer);
+   }
+
+   /* Initialize the SVBI 0 register to zero and set the maximum index.
+    * These values will be sent to the hardware on the next draw.
+    */
+   brw->state.dirty.brw |= BRW_NEW_SOL_INDICES;
+   brw->sol.svbi_0_starting_index = 0;
+   brw->sol.svbi_0_max_index = max_index;
+   brw->sol.offset_0_batch_start = 0;
+}
+
+void
+brw_end_transform_feedback(struct gl_context *ctx,
+                           struct gl_transform_feedback_object *obj)
+{
+   /* After EndTransformFeedback, it's likely that the client program will try
+    * to draw using the contents of the transform feedback buffer as vertex
+    * input.  In order for this to work, we need to flush the data through at
+    * least the GS stage of the pipeline, and flush out the render cache.  For
+    * simplicity, just do a full flush.
+    */
+   struct brw_context *brw = brw_context(ctx);
+   struct intel_context *intel = &brw->intel;
+   intel_batchbuffer_emit_mi_flush(intel);
+}